If you are looking for a freeware that will convert OST to PST file format quickly and easily, OST2 is what you need. After a couple of clicks, you will be able to open the converted PST file in Outlook.
Our OST converter is useful if, for some reason, Microsoft Exchange Server data needs to be moved and opened in Microsoft Outlook. This free converter is able to do it simply and easily. Convert files in a couple of clicks - select an OST file and choose the location where you want to save the PST file. OST2 will automatically connect the converted files to Outlook*, so you won’t need to import .pst files manually. With the Free version of OST2 you will be able to convert up to 5 items in each folder of orphaned OST or PST file.
Using OST2, you can import and export OST and PST files, data from and to Microsoft Outlook, Exchange, Office 365, Outlook.com, Google and G Suite. You will be able to choose a specific OST or PST file or you can scan your computer and OST2 will find all OST and PST files. Convert orphaned OST files to PST format using OST2 Enterprise Edition. It means that you can convert OST files that are not connected to Outlook.
OST to PST conversion can be a solution of problems caused by Exchange Server. In case of your Exchange Server downtime, accidental user account deletion, the server crashes and your data is not accessible, you may want to convert OST to PST file format. All your emails, calendars, contacts, tasks etc. can be opened in Outlook after the OST2PST conversion. To prevent Offline Storage .ost file’s data loss, it is useful to back up data in the Personal Storage file format. Back up Exchange data using this simple OST to PST converter.*Get more with OST2 Enterprise Edition:

Convert OST files that are not connected to Microsoft Outlook (orphaned OST files)

Main features of OST2:

Convert OST to PST (Exchange Offline Storage files to Personal Storage) files. Use OST2 as ost to pst converter to transfer data from Exchange to Outlook, make your Exchange account emails, calendar, contacts and other items accessible through Outlook. With Free OST2 you will able to convert 5 items in each folder of orphaned OST file. In order to get the full advantage of the software, please check OST2 Enterprise Edition.

Use this OST converter tool to back up data as a .PST file in case something happens to Exchange Server. For fully customizable Microsoft Outlook and Exchange backup, see our Safe PST Backup Enterprise Edition software.

New! Mode "Recovery Mode"

Use new mode of conversion called “Recovery Mode” which is dedicated to get as much data as possible from source file. This mode is dedicated for both orphaned and connected OST files. Using this mode OST2 Un-hides items that are hidden in each folder of original file when saving them to destination and more.

By converting OST files to PST format, the Exchange mailbox can be restored even after accidental Exchange user mailbox deletion. Convert OST file and open Exchange mailbox emails, contacts, calendars and other folders in Outlook easily.

Transfer and migrate OST or PST files

Import and export OST and PST files, data from and to Microsoft Outlook, Exchange, Office 365, Outlook.com, Gmail and G Suite. The Free OST2 version allows you to transfer up to 5 items from each folder.

After OST file is converted to the PST file format, it can be automatically connected to your Outlook. So you won’t need to import the PST file to Outlook manually. OST2 is able to import a single file or a batch of files at once. Also you can open PST files with free Outlook viewer.

OST2 supports network location, so you can choose any OST file from your network and select any network location, where the converted files will be stored.

Automatic detection of OST and PST files

OST2 can detect and locate OST and PST files on your computer, so there is no need to browse for OST and PST files manually. OST2 will find not only connected OST files, but also orphaned OST files, as well as PST files.